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SciJava Common is a shared library for SciJava software. It provides a plugin framework, with an extensible mechanism for service discovery, backed by its own annotation processor, so that plugins can be loaded dynamically. It is used by downstream projects in the SciJava ecosystem, such as ImageJ and SCIFIO.
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package org.scijava.util;
/**
* Utility methods for working with units.
*
* @author Barry DeZonia
* @author Curtis Rueden
*/
public final class UnitUtils {
private static final String[] BYTE_UNITS = { "B", "KiB", "MiB", "GiB",
"TiB", "PiB", "EiB", "ZiB", "YiB" };
private static final double LOG1024 = Math.log(1024);
private UnitUtils() {
// prevent instantiation of utility class
}
public static String getAbbreviatedByteLabel(final double totBytes) {
if (totBytes < 0) {
throw new IllegalArgumentException("Bytes must be non-negative");
}
if (totBytes == 0) return "0B";
// compute unit
final int rawPow = (int) (Math.log(totBytes) / LOG1024);
final int pow = Math.min(rawPow, BYTE_UNITS.length - 1);
// compute value from unit
final double value = totBytes / Math.pow(1024.0, pow);
// format result with 0 decimal places for bytes, or 1 for larger values
final String format = pow == 0 ? "%.0f%s" : "%.1f%s";
return String.format(format, value, BYTE_UNITS[pow]);
}
}